<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 3. 使用箭头函数改写下列代码
    arr.forEach(function (v, i) {
        console.log(v, i)
    }) -->
    <script>
        const arr = [125,140,134,120,120,125,130]
        arr.forEach((v,i)=>{
            console.log(v,i)
        })
    </script>
</body>
</html>